Effective Utilization in Resources with Simultaneous Synthesis of Iron Carbide and Rutile by Thermochemical Reactions of Ilmenite Ore

钛工业由涂料、颜料和金属制品组成。主要原料为天然金红石(二氧化钛)和钛铁矿(三氧化二铁)。在目前的工作中，我们试图利用固体和还原气体之间的火法冶金反应，从钛铁矿中同时生产碳化铁和金红石(TiO_2)，设想这两种产品可以随后以任何方式分离。碳化铁作为废钢的替代铁源近来备受关注。如果这一工艺操作成功，它可以同时为每个行业提供有价值的钛和铁材料，并从废物中产生效益。至于碳化铁，我们已经报道了几篇论文，其中证明了反应气体中的微量硫可以使碳化铁更稳定，而不会从许多类型的铁矿石中析出任何烟尘。Natura…更多L钛铁矿(印度喀拉拉邦奎隆)。以天然钛铁矿(主要是FeTiO_3)为原料，通过与H_2-CO或H_2-CH_4混合气体的热化学反应同时合成碳化铁(主要是渗碳体Fe_3C_2，θ相)和金红石(TiO_2)。对于钛铁矿样品，证实了在1073-1273K的温度下，低硫压的混合气体不能形成FeS。对于钛铁矿样品，证实了在没有游离碳的情况下，两种气体中的微量硫可以稳定地生成碳化铁，这与我们以前对铁矿的研究结果类似钛铁矿部分转化为金红石和金属铁，然后发生铁碳化，金红石进一步还原。两种混合气体在后期都有碳化铁和低钛氧化物，如马格尼利相(Ti2n-1&gt；2n-1&gt；，4≦n≦9，即TiOlt；2-x&gt；)和/或Ti3O5而不是金红石。较少

The titanium industry consists of paint pigments and metallic products. As their main feedstocks, natural rutile (TiO_2) and ilmenite ore (FeTiO_3) are known. In the future it is supposed that the latter has a potential to be useful as the main resource because the former is diminishing.In the present work, we have tried to produce both iron carbides and rutile (TiO_2) from ilmenite ore by utilizing pyrometallurgical reactions between solids and reducing gas, imaging that both products could be subsequently separated by any means. Iron carbide is recently focused as an alternative iron source to steel scrap. If this process is operated successfully, it could supply both valuable titanium and ferrous materials simultaneously into each industry and generate benefits from wastes. As for iron carbide, we have reported several papers in which it was proved that traces of sulfur in reaction gas makes iron carbides more stable without any soot precipitation from many types of iron ores.Natura … More l ilmenite ore (Quilon, Kerala, India. Main mineral : FeTiO_3) was employed for reaction tests.Finally, this research was concluded as the followings.Simultaneous synthesis of iron carbides (mainly cementite Fe_3C_2, θphase) and rutile (TiO_2) from natural ilmenite ore (mainly FeTiO_3) were investigated by thermochemical reactions with H_2-CO or H_2-CH_4 gas mixtures having low sulfur pressures incapable of forming FeS at the temperatures of 1073-1273K.For the ilmenite samples it was confirmed that traces of sulfur in both gas mixtures produce iron carbides stably without free carbon, analogous to our previous results obtained for iron ores.In the first stage, partial conversion from ilmenite to rutile and metallic iron proceeded and then iron carbidization occurred with further reduction of rutile. Both gas mixtures provided iron carbide and lower titanium oxides such as Magneli phases (Ti_nO_<2n-1>, 4≦n≦9, namely TiO_<2-x> ) and/or Ti_3O_5 rather than rutile during the later stages.Ti_3O_5 andTi_4O_7 phases tended to exist with increasing temperatures rather than TiO_2 Only Ti_4O_7 was identified as one of the Magneli phases. Less